Control system.



L- J- HIBBARD.

CONTROL SYSTEM. APPLICATION FILED n.2, 9n.

Patented Apr. 1, 1919-.

' INVENTOR L/oydJ H/bbard v WITNESSES:

&{ mew-41m 7 m WZZZJ.

ATTORNEY tact segment for LLOYD J'. HIBBARD, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR T0 WESTINGHOUSE ELECTRIC & MANUFACTURING CONTROL SYSTEM.

Specification of Letters Patent.

COMPANY, A CORPORATION OF PENNSYLVANIA.

Patented Apr. 1, 1919.

Application med March 2, 1917. Serial No. 151,945.

To all whom it may concern:

Be it known that I, LLOYD J. HIBBARD, a citizen of the United States, and a resident of \Vilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Control Systems, of which the following is a specification.

My invention relates to systems of control and particularly to systems of control for electric-railway vehicles.

One object of my invention is to provide a control system of simplified construction that shall insure the operation, direction, of the motors of a railway vehicle in case of an emergency requiring a rapid reversal in the direction of movement of the vehicle.

Another object of my invention is to provide a control system for an electric motor which shall insure the slow operation of a controller in order to accelerate the motor in a forward direction and permit the rapid operation of the controller in order to accelerate the motor in a reverse direction.

More specifically, my invention embodies a control system for an electric motor which is provided with a controller having a conclosing a circuit only in the first position thereof to energize a line switch. The line switch connects the motor across a supply circuit for operating the same in a forward or in a reverse direction. When the line switch is operated in the first position of the controller, a holding circuit is established therefor by means of an interlock switch associated therewith. A contact segment is associated with the motor-reversing switch for insuring the energization of the line switch in any position of the controller when the motor is connected for operation in a reverse direction.

In the prior art, control systems for electric-railway vehicles are disclosed in which it is essential to operate the controller slowly past the first operative position, whether the motors are connected for forward or for reverse operation, in order to insure the operation of the line switch to connect the motors across the supply circuit. Thus, in case the car is moving in a forward direction and it is essential to quickly reverse the direction of rotation of the motors, in order to prevent an accident, the operator of the vehicle may operate his reversing switch and switch is energized in any in a reverse then operate the controller rapidly past the first operative position and prevent the energization of the motor to avoid an accident.

However, in a control system constructed in accordance with my invention, the line position of the controller to connect the motor across the supply circuit when the motor is connected for operation in a reverse direction.

-The single figure of the accompanying drawing is a diagrammatic view of a system of control constructed in accordance with my invention.

Referring to the drawing, two motors M and M which embody armatures 1 and 2 and field windings and a, are adapted to be connected in-series with the resistors 7, 8, 9and 10 across a supply circuit comprising a trolley conductor 5 and a ground return conductor (3 by means of a line switch LS and a controller 11. A reversing switch RS, of a familiar and well known constructron, is provided for reversing the direction of rotat1on of the motors, and acontact segment 12, which is associated with the reversing switch, engages a contact finger 13 when the reversing switch is in a reverse position, for a purpose to be described later.

The controller 11 embodies contact segments 14. 16 and 17 which are adapted to engage contact fingers 18 to 28, inclusive, when the controller is moved through positions a to 2', inclusive, for accelerating the motors in series and in parallel-circuit relation. A slip segment 29 of the type disclosed in the application of N. V. Storer, Serial No. 774,394, filed June 18, 191.3, is adapted to engage contact fingers 30 and 31 when the controller is moved in a forward direction and to be disengaged from the contact fingers 30 and 31 when the controller is moved in a reverse direction a predetermined distance. A contact segment 32, which is associated with the controller, is adapted to e-ngagea contact finger 33 in the first operative position of the controller for completing a circuit through the coil of the line switch LS.

An overload trip switch OT having a coil inserted in the circuit of the motors M and M is provided for preventing an excessive current from passing through the motors at any time during the operation thereof. plurality of resistors 34, 35 and .36 is conneeted across the supply conductors 5 and 6, and a circuit comprising the overload trisp switch OT, the coil of the line switch L door-interlock switches 37 38, 39 and 40 and the contact segment 32, is connected in shunt to the resistor 36. The line switch LS is provided with an interlock switch LS 1n which is adapted to establish a holding 01rcuit for the line switch after the same 1s operated.

Assuming the reversing switch RS to be set for operating the motors in a forward direction and the door-interlock switches to be closed, the motors are connected across the supply conductors 5 and 6 when the controller 11 is moved to position a. In position a of the controller, a circuit is completed from the trolley conductor 5 through the contact fingers 30 and 31wl 11ch are bridged by the slip segment 29-res1stors 34 and 35, overload trip switch OT, the c011 of the line switch LS, interlock switches 37, 38, 39 and 40, contact finger 33, and the contact segment 32 to the ground conductor 6. Thus, the line switch LS is operated and a circult is completed through the motors M and M which may be traced from the trolley conductor 5 through the coil of the overload trip switch OT, line switch LS, contact fingers l8 and l9which are bridged by the contact segment l4 resistors 7, 8, 9 and 10, motor M contact fingers 25 and 26which are bridged by the contact segment 16and motor M to the ground conductor 6.

In positions 6, 0, d and e, the resistors 7, 8, 9 and 10 are successively excluded from the circuit of the motors, between positions a and f the transition of the motors from series to parallel-circuit relation is effected in a well-known manner, and, in positions f to 2', the motors are accelerated in parallelcircuit relation.

In operating the vehicle in a forward di rection, it is essential to move the controller slowly through position ain order to effect operation of the line switch LS and establish a holding circuit for the same, through the interlock switch LS-in.

WVhen the motors M and M are set for operation in a reverse direction, a circuit is completed through the line switch LS which may be traced from the supply conductor 5 through the contact fingers 30 and 31-whiclr are bridged by the slip segment 29-resistors 34 and 35, overload trip switch OT, coil of the line switch LS, contact finger 13 and the contact segment 12 to the ground conductor 6. Thus, when the motors are connected for operation in a reverse direction, the coil of the line switch is connected directly to the ground conductor through the reversing switch without the interposition of the door-interlock switches and the contact segment 32 of the controller 11, which insures the operation of the line switch LS and the energizatidn of the motors M and gardless of M in any position of the controller 11, re-

the speed at which the latter is operated.

Modifications in the system and arrangement and location of parts may be made within the spirit and scope of my inventionand such modifications are intended to be coyered by the appended claims.

I claim as my invention:

1. In a system of control, the combination with a supply circuit, a motor, a controller for governing the operation of the motor, and a line switch for connecting the motor across the supply circuit, of a plurality of independently operable switch segments for preventing the operation of the line switch under predetermined conditions when the motor is connected for operation in a forward direction, and means for establishing a shunt circuit around said switch segments when the motor is connected for operation in a reverse direction.

2. In a system of control, the combination with a motor, and a controller for governing the operation of the motor, of a plurality of unitary switch members for preventing the operation of the motor under predetermined conditions when the motor is connected for operation in a forward direction, and means for establishing a shunt circuit around said switch members when the motor is connected for operation in 'a reverse direction.

In a system of control, the combination with a motor, and a controller for governing the operation of the motor, of means for effecting acceleration of the motor in a forward direction only when the controller is moved slowly past an operative position thereof, and means for insuring the operation of the motor in all positions of the controller when the motor is connected for operation in a reverse direction.

4. In a system of control, the combination with a supply circuit, a motor, and a con troller for governing the operation of the motor, of a line switch for connecting the motor across the supply circuit and adapted to prevent the acceleration of the motor when the controller is moved rapidly through-its first operative position and the motor is connected for operation in a forward direction, and means for permitting the operation of the line switch in any operative position of the controller when the motor is connected for operation in a reverse direction.

position and the motor is connected for in all positions of the controller when the operation in a forward direction, and means motor is connected for rotation in a reverse for establishing an energizing circuit for direction, and means for preventing the conthe line switch in any position of the connection of the motor across the supply cirtroller when the motor is connected for cuit under predetermined conditions when operation in a reverse direction. the motor is connected for rotation in a for- 6. In a system of control, the combination ward direction. Y I

with a motor, and a controller for governing 10. In a system of control, the combinathe operation thereof, of means for preventtion with a supply circuit, a motor, a con- 10 ing the energization of the motor under pretroller for governing the operation of the determined conditions when the controller motor, and a line switch for connecting the is in an operative posltion and the motor is motor across the supply circuit, of means, connected for operation in a forward direccomprising a plurality of switch segments tion, and means for insuring the energizaand interlock switches, for efiecting the tion of the motor in all positions of the conoperation of the line switchwhen the controller when the motor is connected for troller is in thefirst operative positionand operation in a reverse direction. the motor is connected for rotation in a 7. In a system of control, the combination forward direction, an interlock switch assowith a supply circuit, a motor, and a .conciated with the line switch for establishing 2o troller for governing the operat on of the aholding circuit for the line switch, and a motor, of means for connecting the motor contact segment for insuring the operation across the supply circuit to operate it in a of the line switch in any operative position forward direction only when the controller of the controller when the motor is conis moved slowly past the first operative nected for rotation in a reverse direction. position, and means for insuring the con- 11. In a system of control, the combinanection of the motor across he supply cir-. tion with a supply circuit, .a motor, a concuit in all positions of theoontrollei when troller for governing the operation of. the

reverse direction. direction of rotation of the motor, and a the motor 15 connected for operation in a motor, a reversing s tch for reversing the 8. In a system of control, the combination line switch for connecting the motor across with a supply circuit, a motor, a controller the supply circuit, of a contact segment for govermng the operation of the motor, associated with the controller'for establishand a line switch for connecting the motor. ing anenergizing circuit for the line switch across the supply circuit, of means for prein the first position of the controller when venting the operation of theline switch under the. motor is connected for rotation in a predetermined -conditions when the motor is forward direction, and a second contact segconnected for operation in a forward direcment associated with the reversing switch tion, and means for insuring the operation for insuring the energization of the line of the line switch in all positions of the switch in all positions of the controller when 40 controller when the motor is connected for the motor is connected for rotation in a reoperation in a reverse direction. verse direction.

9. In a system of control, the combination In testimony whereof I have hereunto with a supply circuit, a motor, and a consubscribed my name this 26th day of Feb., troller for governing the operation of the 1917 46 motor, of means for insuring the connection of the motor across the supply circuit LLOYD J. HIBBARD. 

